Underwater needle-plate electrical bubble pulsation and impact characteristics

ZHANG Siyuan; LIU Zheng; WANG Zhiqiang; WANG Jinjun; LI Guofeng

doi:10.11883/bzycj-2021-0421

Volume 42 Issue 7

Jul. 2022

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ZHANG Siyuan, LIU Zheng, WANG Zhiqiang, WANG Jinjun, LI Guofeng. Underwater needle-plate electrical bubble pulsation and impact characteristics[J]. Explosion And Shock Waves, 2022, 42(7): 072201. doi: 10.11883/bzycj-2021-0421

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ZHANG Siyuan, LIU Zheng, WANG Zhiqiang, WANG Jinjun, LI Guofeng. Underwater needle-plate electrical bubble pulsation and impact characteristics[J]. Explosion And Shock Waves, 2022, 42(7): 072201. doi: 10.11883/bzycj-2021-0421

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Underwater needle-plate electrical bubble pulsation and impact characteristics

doi: 10.11883/bzycj-2021-0421

School of Electrical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China

Received Date: 2021-10-08
Rev Recd Date: 2022-03-28

Available Online: 2022-03-29

Publish Date: 2022-07-25

Abstract

Abstract

In order to clarify the bubble pulsation process and pressure wave shock characteristics produced in the process of pulse discharge energy release in water, based on the principle of energy equivalence, the liquid-phase pulse energy was transformed into an explosion source with the same energy, and the fluid-structure coupling model of underwater explosion with needle-plate electrode structure was established in LS-DYNA software to simulate the bubble pulsation process on the upper surface of steel substrate. By comparing with the experimental physical images obtained by high-speed photography, it was found that the numerical simulation was highly consistent with the experimental results in terms of bubble morphology and time evolution scales. On this basis, the impact characteristics of the bubbles was further analyzed, and the results show that the maximum impact pressure of the shock wave on the steel base can reach 94.9 MPa when the discharge is carried out with a 4-mm gap at a voltage of 20 kV and a capacitance of 0.8 μF. Besides, the bubble radius, expansion, jet velocity, pulsation period and peak shock wave pressure enhance with the increase of the discharge energy and decrease with the rise of the hydrostatic pressure. Among them, the increase of water pressure has little effect on the bubble expansion rate. The peak value of secondary pressure wave rises from 2.89 MPa to 4.09 MPa with the increase of voltage (14−20 kV), which reaches 41.5%; and up from 5.15 MPa to 6.36 MPa with the rise of hydrostatic pressure (202.65−506.63 kPa), which reaches 23.5%. And the enhancement of discharge energy and water pressure improves the secondary pressure wave significantly. Meanwhile, with the improvement of transmission distance, the proportion of secondary pressure wave in the peak pressure of shock wave rises from 12.6% to 35.3%, and the secondary pressure wave at the far-field discharge location cannot be ignored.
- underwater pulse discharge,
- bubble pulsation,
- shockwave release,
- hydrostatic pressure

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References(27)

References

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